THE FIRST YOKE MOORING FOR A VLCC IN THE OPEN OCEAN

A permanently moored storage vessel for crude oil was installed in March, 1978 in the South China Sea approximately 115 naut mi (213 km) off the coast of Malaysia in 214 ft (65 m) or water. The system constitutes the first yoke mooring for a VLCC (Very Large Crude Carrier) in the open ocean. The mooring is a SALS (Single Anchor Leg Storage) system which employs a slender riser and depends on buoyancy in the rigid mooring yoke to provide the necessary restoring moment. This paper broadly describes the technical aspects of the mooring system such as the design philosophy, model testing performed and engineering criteria. It specifically addresses many novel aspects of the installation of the mooring system; the horizontal tow of the combined mooring base and riser, the free upending of the system, the vertical tow of the system to the mooring site, and the hookup of the VLCC with the rigid yoke to the installed riser. In addition, the paper describes the experience gained with the operations of the storage vessel and the alongside mooring procedures which are utilized to offtake crude oil from the storage vessel to shuttle vessels. Information contained in this paper is directly applicable to the design and installation of any single point mooring system for the open ocean.

  • Supplemental Notes:
    • Proceedings of the Eleventh Annual OTC held in Houston, Texas, April 30-May 3, 1979, Volume 3.
  • Corporate Authors:

    Offshore Technology Conference

    6200 North Central Expressway
    Dallas, TX  USA  45206
  • Authors:
    • Poranski, P F
    • Gillespie, A M
    • Smulders, L
  • Publication Date: 1979

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Filing Info

  • Accession Number: 00195801
  • Record Type: Publication
  • Source Agency: Offshore Technology Conference
  • Report/Paper Numbers: Volume 3 Proceeding
  • Files: TRIS
  • Created Date: Jul 31 1979 12:00AM